Transporting device for marginal punched webs

Abstract

A transporting device for marginal punched single-layered or multiple-layered webs of material, in particular for record carriers in a printer, is provided. Such a transporting device serves for marginal punched single-layered or multiple-layered webs of material (1), in particular for paper record carriers in a printer, and consists of frames (2) on both sides of the web of material (1) which are adjustable to the width of the web of material, with sprockets (3a,3b) in each case rotatably mounted thereon, of a sprocket drive, of continuous toothed belts (6) stretched around the sprockets (3a,3b) and provided on the inner side (9) with teeth (10), on which belts transporting pins (8) are attached on the outer side (7), which engage force-locking and form-locking into the marginal perforations of the web of material (1) and further consists in each case of a guide plate (11 or 12) able to be pivoted parallel to the web of material (1) up to a guiding slit (14) to the frames (2), which plates cover the web of material (1) and which are provided in each case with a recess (15) for the unimpeded movement of the transporting pins (8) and further consist of means to press the web of material (1) against the toothed belts (6).

I claim: 
     
       1. A transporting device for margin punched webs comprising: a frame supporting at least two sprockets around which an endless belt extends;   a sprocket drive for moving the belt in a continuous path around the sprockets;   longitudinally spaced transporting pins upon and along the belt directed outwardly therefrom for engaging similarly spaced marginal perforations in said web;   a guideplate along one edge pivotally mounted upon said frame facing a portion of said continuous path that extends between the sprockets and having an elongated recess for receiving the distal ends of the transporting pins;   said guideplate being mounted for pivotal movement about an axis substantially parallel to said portion of the continuous path of the belt;   said belt adapted to engage the undersurface of said web;   longitudinally spaced ribs spaced between said sprockets rigidly mounted on and projecting from said frame and underlying said belt;   an elongated leaf spring yieldably bearing against said belt, said leaf spring being located within the continuous path followed by the belt around the sprockets and yieldably urging the belt toward the guideplate as it moves along said path portion to hold said web between the belt and guideplate;   said leaf spring having inclined ramp portions formed on opposite ends of a central portion, said ramp portions terminating in reversely bent sections at the ends of said ramp portions, said reversely bent sections comprising the sole means for detachably attaching and rigidly fastening said leaf spring to said ribs wherein the central portion of said leaf spring is yieldably supported on the ribs solely by the ramp portions.   
     
     
       2. In the transporting device of claim 1, wherein the belt has longitudinally spaced teeth on its inner side which engage the sprockets as the belt moves in its continuous path, and the teeth move over and are supported by the pre-stressed flat spring. 
     
     
       3. In the transporting device of claim 1, a second guideplate underlying and spaced upon said first guideplate and sprockets, along one edge pivotally mounted upon said frame and facing a portion of the return flight of said continuous path between the sprockets and having an elongated recess for receiving the distal ends of the transporting pins; second longitudinally spaced ribs mounted on and projecting from said frame within and overlying the belt;   a second elongated leaf spring yieldably bearing against said belt, said leaf spring being located within the continuous path followed by the belt around the sprockets and yieldably urging the belt toward the second guideplate as it moves along said path portion on the return flight to hold said web between the belt and guideplate;   said second leaf spring having inclined ramp portions formed on opposite ends of a central portion, said ramp portions terminating in reversely bent sections at the ends of said ramp portions, said reversely bent sections comprising the sole means for detachably attaching and rigidly fastening said leaf spring to said ribs wherein the central portion of said second leaf spring is yieldably supported on the ribs solely by the ramp portions.